A new genus and species of Amerobelbidae (Acari: Oribatida) from Vietnam

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A new genus and species of Amerobelbidae (Acari:

Oribatida) from Vietnam

S.G. Ermilov

To cite this version:

S.G. Ermilov. A new genus and species of Amerobelbidae (Acari: Oribatida) from Vietnam. Acarolo-

gia, Acarologia, 2011, 51 (3), pp.275-282. �10.1051/acarologia/20112012�. �hal-01600028�

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Acarologia 51(3): 275–282 (2011) DOI: 10.1051/acarologia/20112012

A NEW GENUS AND SPECIES OF AMEROBELBIDAE (ACARI: ORIBATIDA) FROM VIETNAM

Sergey G. E

(Received 29 March 2011; accepted 02 June 2011; published online 23 September 2011)

Laboratory of Entomology, Phytosanitary Department, Nizhniy Novgorod Referral Center of the Federal Service for Veterinary and Phytosanitary Inspection, Nizhniy Novgorod, Russia. ermilovacari@yandex.ru

ABSTRACT— A new genus,Roynortonian. gen., with its type species, Roynortonia vietnamican. sp., belonging to the family Amerobelbidae, is proposed and described from dark loamy soil ofLagerstroemiaforest of Cat Tien National Park (southern Vietnam). An identification key to the known genera of Amerobelbidae is presented.

KEYWORDS— oribatid mites; new genus; new species; Amerobelbidae; Vietnam

I

In the course of faunistic studies of oribatid mite fauna of Cat Tien National Park (southern Vietnam), I found a new species of the family Amerobelbidae (Ameroidea). This small family includes five genera with 11 species distributed in the Holarctic region (Subías 2004, online version 2010), but no species was known from Vietnam. On the basis of analysis of generic character states, I propose a new genus, Roynortonian. gen., withRoynortonia vietnamican.

sp.as type species.

M

Collection locality and habitat of the new species are characterized in the "Material examined" sec- tion. Specimens were studied in lactic acid, mounted in temporary cavity slides, then stored in 70% alcohol in vials. All body measurements are presented in micrometers. Body length was mea-

sured in lateral view, from the tip of the rostrum to the posterior edge of the ventral plate, to avoid discrepancies caused by different degrees of noto- gastral distension. Notogastral width refers to the maximum width in dorsal aspect. Length of body setae was measured in lateral aspect.

F

A

Diagnosis

General characters of the family Amerobelbidae (Grandjean 1965). Rostrum rounded in dorsal view.

Lamellar lines absent. Rostral (ro) and lamellar (le) setae setiform, short. Interlamellar (in) setae seti- form, long. Lamellar setae inserted closer to inter- lamellar setae than to rostral setae. Sensilli (ss) with short cilia. Bothridia modified, with long, rigid pro- jection posteriorly. Dorsosejugal scissure complete,

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ISSN 0044-586-X (print). ISSN 2107-7207 (electronic)

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slightly convex. Notogaster with one pair of short, thin spines anterolaterally. Epimeral setal formula 3-1-3-3. Aggenital neotrichy absent, one pair of aggenital setae present. Epimeral setae3bmodified, long, thorn-like. Epimeral setae3b,3c,4band4cpo- sitioned adjacent to each other, so that epimeres III and IV without setae laterally.

Type species —Roynortonia vietnamican. sp.

Etymology — The genus is named in honor of Prof. Dr. Roy A. Norton (State University of New York, College of Environmental Science and Forestry, Syracuse, USA), the distinguished acarol- ogist, for his extensive contributions to our knowl- edge of the oribatid mites.

Remarks — The family Amerobelbidae com- prises five genera: Amerobelba Berlese, 1908,Bern- damerus Mahunka, 1977, Hellenamerus Mahunka, 1974, Mongaillardia Grandjean, 1961, Rastellobata Grandjean, 1961. Two other genera, Yambaramerus andGrypoceramerus, have been included in Amero- belbidae, but I question this placement.

Aoki (1996) described Yambaramerus including it in Amerobelbidae. However both known rep- resentative of Yambaramerus, Y. arcuatusAoki and Yamamoto, 2000 andY. itoiAoki, 1996, differ from other Amerobelbidae by body proportions (prodor- sum and notogaster approximately equal in length inYambaramerus; prodorsum obviously shorter than notogaster in other Amerobelbidae), lamellar se- tae inserted on well-developed apophyses, close to each other (not inserted on well-developed apophy- ses, and not close each other in other Amerobel- bidae), lamellar lines well-developed (lamellar lines absent or slightly developed in other Amerobel- bidae), presence of ring-like structures adjacent to interlamellar setae (absent in other Amerobelbidae), notogaster with two pairs of long and strongly developed thorn-like processes in humeral region (thorn-like structures absent or only one pair of small tubercles or spines present in other Amero- belbidae).

Suzuki and Aoki (1970) described Grypocer- amerus and included it in Amerobelbidae. How- ever, the representative ofGrypoceramerus,G. acutus Suzuki and Aoki, 1970, strongly differs from other Amerobelbidae by body proportions (prodorsum

and notogaster approximately equal in length in Grypoceramerus; prodorsum obviously shorter than notogaster in other Amerobelbidae), notogastral se- taec and la adjacent to each other and separated from other setae (not adjacent to each other or re- moved from other setae in other Amerobelbidae).

In my opinion, based on these character states YambaramerusandGrypoceramerusare dissimilar to other genera of Amerobelbidae, and should not be considered members of this family. I do not dis- cuss a place ofYambaramerusandGrypoceramerusin Ameroidea herein, their placement should be ad- dressed in a separate publication.

Roynortonian. gen. clearly differs from all other genera of Amerobelbidae by the following charac- ters: 1) epimeral setae3bmodified, long, thorn-like, 2) epimeral setae3b,3c,4b and4cpositioned adja- cent to each other, 3) absence of aggenital neotrichy.

Modified epimeral seta3bis unique in Ameroidea and as far as I know it is unknown in Brachypylina.

The presence of one pair of aggenital setae is unique in Amerobelbidae, all other genera express aggeni- tal neotrichy; the type species of the new genus has an unusual structure – a long, rigid projection pos- terior to the bothridium. This is the first record of a bothridia bearing projection in Brachypylina. How- ever, there are a small number of oribatid species with short bothridial projections in a same position in the Ameroidea, for example,Staurobates schusteri Grandjean, 1966 and Stauroma cephalotum Grand- jean, 1966 in Staurobatidae.

The new genus is most similar toAmerobelbain morphology of lamellar setae, absence of lamellar lines, absence of well-developed notogastral tuber- cles in humeral region (absent inAmerobelba, only very short spines developed inRoynortonian. gen.), position of notogastral setae.

Key to known genera of Amerobelbidae 1. Epimeral setae3bmodified, thorn-like; aggenital neotrichy absent . . . .Roynortonian. gen.

— Epimeral setae3bnot modified, setiform; aggen- ital neotrichy present . . . 2 2. Dorsal notogastral setae located medially on no- togaster, setaec1 and la inserted adjacent to each 276

Acarologia 51(3): 275–282 (2011)

FIGURE1:Roynortonia vietnamican. sp.: A – dorsal view, legs not shown, B – ventral view, gnathosoma and legs partly not shown, C – lateral view, gnathosoma and legs partly not shown. Scale bar (A+B, C) 50µm.

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other . . . .Hellenamerus

— Dorsal notogastral setae located both medially and laterally on notogaster . . . 3 3. Sensilli with very long cilia; notogastral setae long, la and lm reaching insertions h3 and lp, ac- cordingly . . . .Rastellobata

— Sensilli with short cilia; notogastral setae shorter . . . 4 4. Sexual dimorphism present: males with hook- shaped lamellar setae . . . .Mongaillardia

— Sexual dimorphism absent: males with normal lamellar setae . . . 5

5. Prodorsum with well-developed lamellar lines; notogastral tubercles in humeral region present. . . .Berndamerus

— Prodorsum without well-developed lamellar lines; notogastral tubercles in humeral region ab- sent . . . .Amerobelba

D

(Figures 1 – 3)

Diagnosis

Body size 196 – 229 x 108 – 123; rostral and lamel- lar setae short, minute barbed; interlamellar setae long, barbed. Bothridial projections long, rigid, di- rected posterolaterally, 20 – 24, smooth. Notogas- tral spines very short (2 – 4), conical. Notogastral setae, 10 pairs, heterotrichous: anterior five pairs of medium long, posterior five pairs shorter. Setae3b (41), thorn-like.

Description

Measurements — Body length 217 (holotype, male), 196 – 229 (six paratypes; two males and four females); body width 114 (holotype, male), 108 – 123 (six paratypes; two males and four females).

Integument — Body color light brown. Surface of body smooth. Granular and cloud-like cerotegu- ment covers lateral parts of body and regions of

dorsosejugal scissure and sejugal apodemes. Gran- ules very small (diameter less than 1µm).

Prodorsum — (Figure 1A, C; Figure 2A–D). Ros- tral and lamellar setae 10 – 12, minute barbed. In- terlamellar setae 36 – 45, barbed. Sensilli long, 57 – 65, setiform, with more than 20 cilia unilaterally.

Bothridial projections long, rigid, directed postero- laterally, 20 – 24, smooth. Exobothridial setae very short (4), thin, smooth.

Notogaster — (Figure 1A, C; Figure 2D). Noto- gastral spines very short (2 – 4), conical. Notogas- tral setae with indistinct barbs; setaec,la,lm,lpand h3(24 – 28) longer than others (12 – 16). Notogastral setae inserted on all notogaster surface. All lyrifis- sures and opisthonotal gland opening distinct; lyri- fissuresialocated posteriorly to notogastral spines.

Anogenital region — (Figure 1B, C; Figure 2E, F).

Two pairs anal (an1,an2, 10 – 12), three pairs adanal (ad1-ad3, 12 – 20), one pair aggenital (ag, 10 – 20) and six pairs genital (g1-g6, 4 – 6) setae setiform, smooth.

Lyrifissuresiadin direct apoanal position.

Epimeral region — (Figure 1B, C; Figure 2G).

Only apodemes 1, 2 and complete sejugal apodeme well-developed. Setae 3b longest (41), thorn-like, smooth, inserted on large apophyses; setae1a, 2a, 4ashortest (12 – 16), setiform, slightly barbed; other setae 20 – 32, setiform, with short barbs.

Gnathosoma — (Figure 2H–J). Subcapitulum longer than wide (45 – 49 x 32 – 34). Hypostomal setae setiform, smooth;h(8 – 10) little longer than m(6 – 8) and a(6). One pair of adoral setae (or1, or2) minute (1). Palp (length 32) with setation 0-2-1- 3-9(+1ω). Solenidion pressed to surface of palptar- sus. Chelicera (57) chelate-dentate. Cheliceral setae setiform, barbed;cha(18) longer, thanchb(12).

Legs — (Figure 3A–D). Formulae of leg setation including famulus and solenidia (in square brack- ets): I (1-5-3-4-20) [1-2-2], II (1-5-3-4-16) [1-1-2], III (2-3-1-3-15) [1-1-0], IV (2-3-2-3-12) [0-1-0]; homol- ogy of setae and solenidia indicated in Table 1. All setae setiform. Famulus short, conical. Solenidiaω₁ on tarsi I,ω₁andω₂on tarsi II,σon genua III thick- ened, rod-like; solenidiaω₂ on tarsi I, ϕ₁ and ϕ₂ setiform; other solenidia thickened, strongly curved in median part.

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FIGURE2:Roynortonia vietnamican. sp.: A – rostral setae, B – interlamellar seta, C – sensillus, D – postbothridial and anterio-lateral notogastral regions, E – genital plate, left, F – anal plate, left, G – epimeral seta3b, H – subcapitulum, I – palp, J – chelicera. Scale bar (A+B, C-G, I) 10µm, scale bar (H, J) 20µm.

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FIGURE3:Roynortonia vietnamican. sp.: A – leg I, right, antiaxial view, B – leg II, right, antiaxial view, C – leg III, right, antiaxial view, D – leg IV, right, antiaxial view. Scale bar 20µm.

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Acarologia 51(3): 275–282 (2011) TABLE1: Leg setation and solenidia ofRoynortonia vietnamican. sp.

Leg Trochanter Femur Genu Tibia Tarsus

I vʹ d, (l), bvʹʹ, vʹʹ (l), vʹ, σ (l), (v), φ₁, φ₂ (ft), (tc), (it), (p), (u), (a), s, (pv), vʹ, (pl), lʹʹ, e, ω1, ω2

II vʹ d, (l), bvʹʹ, vʹʹ (l), vʹ, σ (l), (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv), lʹʹ, ω1, ω2

III lʹ, vʹ d, lʹ, evʹ lʹ, σ lʹ, (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv)

IV lʹ, vʹ d, lʹ, evʹ d, lʹ l', (v), φ ftʹʹ, (tc), (p), (u), (a), s, (pv)

Roman letters refer to normal setae (e – famulus), Greek letters refer to solenidia. One apostrophe (ʹ) marks setae on anterior and double  apostrophe (ʺ) setae on posterior side of the given leg segment. Parentheses refer to a pair of setae. 

Material examined — Holotype (male) and one paratype (male) were obtained from Cat Tien National Park, in southern Vietnam, 11°25’ N, 107°25’ E, 149 m a.s.l., in dark loamy soil ofLager- stroemia forest, February-March 2009, collected by A.E. Anichkin. Five paratypes (one male and four females) were obtained ibid, but: 11°26’ N, 107°25’ E, 145 m a.s.l., 20 November 2006, collected also by A.E. Anichkin.

Type deposition — The holotype is deposited in the collection of the Center for Biodiversity Re- sources Education and Development (CEBRED), Hanoi National University of Education, Vietnam;

four paratypes are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia;

two paratypes (dissected) are in the personal collec- tion of the author.

Etymology — The specific name "vietnamica"

refers to the country of origin, Vietnam.

Distribution. — At present, this species is only known from Cat Tien National Park, in southern Vietnam.

A

I gratefully acknowledge Dr. Valerie Behan- Pelletier (Systematic Entomology, Agriculture and Agri-Food Canada, K.W. Neatby Building, Ottawa, Canada) for thorough review of this manuscript and many valuable suggestions. I also gratefully ac- knowledge Dr. Umukusum Shtanchaeva (Caspian Institute of Biological Resources, Makhachkala, Russia), Prof. Dr. Luis Subías (Universidad Complutense de Madrid, Madrid, Spain) and Ilya Smelyanskiy (Siberian Environmental Centre,

Novosibirsk, Russia) for consultations. I am very grateful to Dr. Alexander E. Anichkin (Institute of Ecological and Evolutionary Problems, Russian Academy of Sciences, Moscow, Russia) for sending oribatid mite material from Vietnam.

R

Aoki J. 1996 —Yambaramerus, a peculiar new genus of oribatid mite found from Okinawa Island (Oribatida, Amerobelbidae) — Biol. Mag. Okinawa, 34: 9-12.

Aoki J., Yamamoto Y. 2000 — Four new species of the Yun- nan province in China (Acari: Oribatida) — Bul. Inst.

Envir. Sci. Tech., Yokohama Nat. Univ., 26: 103-110.

Berlese A. 1908 — Elenco di generi e specie nuovi di Acari

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Grandjean F. 1961 — Les Amerobelbidae (Oribates). Pre- mière partie — Acarologia, 3 (3): 303-343.

Grandjean F. 1965 — Complément a mon travial de 1953 sur la classification des oribates — Acarologia, 7 (4):

714-733.

Grandjean F. 1966 — Les Staurobatidae n. fam. (Oribates)

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Oribatida) — Rev. suisse Zool., 84 (4): 905-916.

Subías L.S. 2004 — Listado sistemático, sinonímico y biogeográfico de los ácaros oribátidos (Acari- formes: Oribatida) del mundo (excepto fosiles) — Graellsia, 60 (número extraordinario): 3-305. On- line version accessed in July 2010. 557 pp.;

(http://www.ucm.es/info/zoo/Artropodos/Catalo go.pdf).

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Suzuki K., Aoki J. 1970 — Some new species of oribatid mites from the Izu Peninsula I.Grypoceramerus acutus gen. n.etsp. n.— Ann. Zool. Japon., 43 (4): 207-210.

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